It is not possible to order just one board from one kit.
Kits will be delivered on panels, as follows :

Single-sided kit is another panel.
Depanelization should be done by yourself. Minimum space between 2 boards is 200mil (4.5mm). The whole board is around 15"*19" (38*48cm).
No V-cutting/Tab routing etc.

Depanelization should not be hard. A saw is ok. A dremel might be a better choice. There is, in my own opinion, enough space to feel confident. Some extra care is still better obviously Just take a piece of paper, draw 2 lines with 4.5mm space between each, you'll see it is OK.

I would be interested on the power amp boars and the protection.If someone just need the preamplifier we could share the set.
Please keep in your mind if someone only interested on the preamp set and let me know.
Thank you
Greetings Gabor